Add codeowner file in .github

[oleksandr-pavlyk]

Add .github/CODEOWNERS file.

• Have you provided a meaningful PR description?
• Have you added a test, reproducer or referred to an issue with a reproducer?
• Have you tested your changes locally for CPU and GPU devices?
• Have you made sure that new changes do not introduce compiler warnings?
• Have you checked performance impact of proposed changes?
• If this PR is a work in progress, are you opening the PR as a draft?

[oleksandr-pavlyk]

I will squash and force push. Thanks for looking up the correct syntax @ndgrigorian

[ndgrigorian]

Github likes it now so LGTM

[github-actions]

Deleted rendered PR docs from intelpython.github.com/dpctl, latest should be updated shortly. 🤞

[coveralls]

coverage: 87.93%. remained the same
when pulling d973f19 on add-codeowner-file
into b9242f4 on master.

[github-actions]

Array API standard conformance tests for dpctl=0.18.0dev0=py310ha798474_256 ran successfully.
Passed: 894
Failed: 1
Skipped: 119

[github-actions]

Array API standard conformance tests for dpctl=0.18.0dev0=py310ha798474_257 ran successfully.
Passed: 894
Failed: 1
Skipped: 119

[github-actions]

Array API standard conformance tests for dpctl=0.18.0dev0=py310ha798474_256 ran successfully.
Passed: 894
Failed: 1
Skipped: 119